The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 2008
Filed:
Nov. 29, 2002
Giulio Colavolpe, Parma, IT;
Enrico Forestieri, Parma, IT;
Giulio Colavolpe, Parma, IT;
Enrico Forestieri, Parma, IT;
Marconi Communications S.p.A., Genoa, IT;
Abstract
A method for the adaptive adjustment of a PMD compensator in optical fiber communication systems with the compensator comprising a cascade of adjustable optical devices through which passes an optical signal to be compensated and comprising the steps of computing the Stokes parameters S, S, S, Sin a number Q of different frequencies of the signal output from the compensator, producing control signals for parameters of at least some of said adjustable optical devices so as to make virtually constant said Stokes parameters computed at different frequencies. A compensator comprising a cascade of adjustable optical devices (-) through which passes an optical signal to be compensated, an adjustment system which takes the components y(t) e y(t) on the two orthogonal polarizations from the signal at the compensator output, and which comprises a controller () which on the basis of said components computes the Stokes parameters S, S, S, Sin a number Q of different frequencies of the signal output by the compensator and which emits control signals for at least some of said adjustable optical devices so as to make virtually constant the Stokes parameters computed at the different frequencies.